Log and stream-indicator.



W. CORNERS-. LOG AND STREAM INDICATOR. APPLICATION FILED new, 191's.

Patented Apr. 28, 1914.-

@Lttommg fiTATES TEN QFTQE.

WILLEIVI CORNELIS, OF UTRECHT, NETHERLANDS.

LOG AND STBEAllE-INDIGATOR.

To all whom it may concern:

to it known that I. NILLEM Counnnis, a subject of the Queen of the Netherlands, residing at Utrecht, Kingdom of the Netherlands, have invented certain new and useful Improvements in Logs and Stream-Indicators, of which the following is a specification.

My invention relates to an improved log and stream indicator, the action of which is not delcteriously affected by friction and other influences as is commonly the case with this class of device.

My improved log comprises a filament, such as for example a smooth metal wire, to which at least two checking devices are attached at a known distance apart, say one twelfth or one sixth of a sea mil-e. These checking devices are adapted to offer a very brief but distinctly perceptible resistance to the passage of a member or disk sliding on the filament or the passage of the filament past a stationary member with which it is slidably engaged, said resistance resulting, in the case of each checking device, in a jerk imparted to the filament, and the jerks being, accordingly, separated by an interval of time which indicates the rate of travel of the vessel pulling the filament, or the stream moving the slidable member on the filament.

An embodiment of the invention is illustrated in the accompanying drawings in which Figure 1 is a view of the complete appliance; Fig. 2 is a side view of one of the checking devices, drawn to a larger scale; Fig. 3 is a plan view of a disk forming part of the appliance; Fig. l is a section through the aforementioned disk; and Fig. 5 is a side view of a hook attached to the end of the filament.

In the drawing 1 represents a smooth metal wire to which checking devices 2 and 3 are attached. The wire is attached to the ship, the distance between the ship and the first checking device being such that this checking device always remains under water and is not affected by the wash in the wake of the vessel. When now a disk l of metal or other material, provided with a central aperture, is placed on the wire'it will slip down until it reaches the water, or else the wire is slipped until the disk reaches the water. The resistance of the water will then keep the disk at rest, without forward or backward movement, the smooth wire traveling Specification of Letters Patent.

Application filed August 29, 1913.

Patented Apr. 28, 1914;.

SeriaI No. 787,322.

through the aperture in the disk. In stream ing water it will be the wire which is kept in rest while the disk is carried along with the speed of the water. checking device 2 reaches the disk, the latter will strike against this device and will be dragged along for a very brief space. Butthe water pressure almost instantly pushes the disk over the checking device, as the diameter of the aperture is a little larger than the diameter of the collars 5 of the checking device. The wire can then travel on at the speed. of the ship without the disk. The engagement of the disk 4 with the checking device 2, however, imparts a erk to the wire, which can be perceived on the ship, for instance by a person touching the wire. When the second checking device 8 reaches and passes through the disk, another jerk is imparted, after an interval of time which can be measured by means of a chronomete-r or other known device. The distance between the checking devices being known, the measurement referred to, indicates the rate of travel of the ship.

In order to facilitate the placing of the disks 4 on the wire, said disks are cut from the edge to the aperture by an oblique sawcut 6 (Figs. 3 and 4). The disks being of an elastic material the saw-cut will close when the disk is placed on the wire and prevent them from falling off. At the end of the wire a hook 7 is arranged in which the disks catch after having passed both checking devices. For slipping and winding up the wire on board the ship a drum 8 may be used, provided with a. winding means.

What I claim is:

1. A log or stream indicator comprising, in combination, a trailing filament; a plurality of checking devices attached at intervals thereto; and a member slidable upon said filament and exposed to the pressure of the water for engaging said devices successively and imparting shocks to the filament consequent upon such engagement.

2. A log or stream indicator comprising, in combination, a trailing filament; a plurality of checking devices attached at intervals thereto and embodying, each, a rod provided with one or more collars; and a member slidable upon said filament and exposed to the pressure of the water for engaging the collars of the successive devices and imparting shocks to the filament consequent upon such engagement.

When the first 3. A log or stream indicator comprising, in combination, a trailing filament; a pinrality of checking devices attached at intervals thereto; and an apertured disk slidable upon said filament and exposed to the pressure of the water for engaging said devices successively and imparting shocks to the filament consequent upon such engagement.

4. A log or stream indicator comprising, in combination, a trailing filament; a pinrality of checking devices attached at inter vals thereto and embodying, each, a rod provided with one or more collars; and an apertured disk slidable upon said filament and Copies of this patent may be obtained for five cents each,

exposed to the pressure of the water for enga'ging the collars of the successive devices and imparting shocks to the filament consequent upon such engagement, the aperture in said disk having a dian'ieter which is slightly greater than that of said collars.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

iVILLEM CORNELIS.

Vitnesses J. F. VANDER RoLr, P. I-IILDEIR.

by addressing the Commissioner of Yatents,

Washington, D. C. 

